Fsc part 2 online preparation for chemistry chapter 3 (group IIIA and Group IVA Elements)

Online Short Questions For Chapter 3 "12th Class Chemistry Chapter 3 Short Questions Preparation "

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Chemistry - 12th Class Chemistry Chapter 3 Short Questions Preparation

Question # 1

Write any two properties of boron which show peculiar behavior?

  • Ans 1: 1.Boron is only element in Group IIIA which is non metallic in behaviour.
    2.It is the only element with less that four electrons in the outermost shell which is not a metal.
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Prepare Complete Set Wise Questions For Chapter 3 "12th Class Chemistry Chapter 3 Short Questions Preparation "

12th Class Chemistry Chapter 3 Short Questions Preparation - Set 1

Question # 1

Write any two properties of boron which show peculiar behavior?

  • Ans 1: 1.Boron is only element in Group IIIA which is non metallic in behaviour.
    2.It is the only element with less that four electrons in the outermost shell which is not a metal.
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 2

Question # 1

Why Boric acid cannot be titrated by NaOH?

  • Ans 1: Boric acid is partially neutralized by caustic soda to give borax so,boric acid cannot be titrated by NaOH.
    4H3BO3+ 2HaOH------->Na2B4O7+ 7H2O
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 3

Question # 1

Write two points to show peculiar behavior of carbon.

  • Ans 1: Carbon differs from remaining members of group IV-A the following respects;
  • Ans 2: i) Carbon and silicon are nonmetals while the other members of the family are metalloids or metals.
    ii) Catenation of self linkage:Carbon has a tendency to form long chain of identical atoms.
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 4

Question # 1

Boron differs from its family members,Discuss?

  • Ans 1:
    1. Boron is only element in group IIIA which is non metallic in behaviour.
    2. Its is the only element with less tha four electron in the outermost shell which is not a metal.
    3. One of the outstanding feature of the chemistry of boron is its ability to form molecular addition compounds.
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12th Class Chemistry Chapter 3 Short Questions Preparation - Set 5

Question # 1

Which elements and compounds can act as semiconductors?

  • Ans 1: Elements:Semiconductor include the elements germanium,selenium and silicons.
  • Ans 2: Compounds:Semiconductor include the compounds lead sulphide,silicon,carbide,cadmium sulphide,lead telluride,gallium arsenide and indium antimonide.
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12th Class Chemistry Chapter 3 Preparation

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